dumbass semiconductor question

[tomg]

On 11-Jun-98, media at mail1.nai.net wrote:

>OK, we all know that you can use an NPN transistor as a current controlled
>switch that is normally open.  I'm trying to modify an ancient drum machine
>for a friend that runs when the footswitch is open and stops when the
>switch is closed (opposite than what you would think).

>So what kind of gizmo can I use to the switch that will normally be closed
>(not running) and open (run) when it receives a voltage or from a keyboard
>gate or x0xbox sync??

Try a 4066 instead of a transistor.
 
 
          +V

          ^
          |
          /    +------
     100K \    | 
          /    |
          \  +-+-+ 
          |  |   | 
          +--+   |
          |  |   | 4066/16
        \    +-+-+
         \     | 
          |    |
          |    +------ 
         -+-
          -
 

Close the switch the 4066 opens. Open and the 4066 is closed.

-Tom